Valve and valve-gear



(No Model.) I

E, F. SPAULDING.

VALVE AND VALVE GEAE.

No. 385,533. Patented July 3 1888.

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ELIJAH F. SPAULDING, OF OIL CITY, ASSIGNOR OF ONE-THIRD TO JOHN K. HALLOCK, OF ERIE, PENNSYLVANIA.

VALVE AND VALVEGEAR.

SPECIFICATION forming part of Letters Patent No. 385,533, dated duty 3i, 1888.

Application filed February 17,1SS7. Serial No. 227.928. (No model.)

.To @ZZ whom it may concern:

Beit known that I, Emana F. SPAULDING,

a citizen of the United States, residing at Oil City, in the county of Vcnango and State of Pennsylvania, have invented certain new and useful Improvements in Steam-Engine Valves and ValveGears; and l do hereby declare the following to be a full, clear, and exact description of theinvention, suoli as willenable others skilled in the art to which it appertains to make and use the same. This invention relates to steam-engines; and it consists in improvementsin the construction ofthe valve and valve-gear thereof, as will be hereinafter fully set forth, and pointed out in the claims.

My invention is illustrated in the accompanying drawings, as follows:

Figure l is a top or plan view ofasteamengine having my improvement thereon, the cylinder and valvechamhcr being in horizontal section and the eccentricrod yoke being also in horizontal section. Fig. 2 is a side elevation. Fig. 3 is au enlarged view of the valve and valve'chamber and a fragment of the cylinder in horizontal section. Fig. 4 is a horizontal sectional view of the eccentric, lthe sleeve upon the eccentric, and the eccen` tric-strap.

rlhe construction is as follows:

rlhe valve C is a piston-valve, and has at each end a chamber with longitudinal ports c, and transverse or circumferential ports c2. The valveseats C have the ordinary transverse ports, b, leading into the cylinder,and longitudinal ports c', communicating with the steamchamber B'.

E E are exhaust-passages at the ends of the valve seats. On theleft of Fig. 3 arrows show the passage of steam into the cylinder, and at the right of the same figure arrows show the passage of exhausbsteam from the cylinder. The valve is designed to have two movements, a reciprocating and a rocking movement. rhe

" rocking movement brings the ports c of the valve into or out of communication with the ports c of the valvesseat, and the reciprocating movement brings the ports c2 of the valve into and out of communication with the ports D of the valveseat.

I am aware that it is common to make piston-valves with longitudinal ports and im` part to said valves both a reciprocating and a rocking movement, (see, for example, Patents Nos. 322,711 and 339,8l4;) but such a construction does not embody my invention, because the transverse ports in the valve which I show do not appear. The valve-gear by which these movements are given to the valve, as will be hereinafter fully explained, gives to the valve a uniform and unchanging reciprocation, but permits of a varying rocking movement, which variation will be effected by the action of the governing apparatus. The cutoff is effected by the rocking of the valve, and hence is variable, while the traverse of the valve is invariable, and hence the exhaust is never choked. It will therefore be seen that by giving this valve the proper movement it will produce all the effects of two valves, one

a variable cut-off and the other an invariable exhaust-valve.

The gear for handling this valve is as follows: C2 is the valvestem,which runs in guides C3 C3, Where it is round and free te turn, so as to rock the valve. Between the guides the valve-stem is split or slotted, as at C".

D is the eccentric-rod, which connects with the valve-stem by a joint, which allows the eccentric-rod to rise and fall, but compels it to communicate to the valvestem any twisting Y or rocking motion it may have imparted to it bythe eccentric-gear. (The eccentric-rod has no lateral swinging motion.)

The eccentric-gear consists, first, of an eccentric, F, which is keyed to the shaft; second, a sleeve, F', which is loose upon the eccentric and may be rolled thereon independently; third, a diagonally-arranged eccentric-strap holder, F2, which is concentric with and fixed to the sleeve F; fourth, an eccentric-strap, D2, adjusted in theholderorpath F2; fth, a yoke, D', on the eccentricrod which spans the strap Dl and is connected with it by trunnions dcl. On the sleeve F are pins f f, or other means for connecting that part with any desirable form of governing device by which said sleeve may be varied in its position-that is, re volved upon the eccentric.

It will be seen that the action of the eccen- XOO trie to reciprocate the eccentric-rod is invariable; also that the diagonal eccentric-strap path or holder F2 will give to the eccentric-rod a twisting or rocking movement; and, further, that the relation ot' the twisting movement to the reciprocating movement can be varied by rolling the sleeve F on the eccentric F without changing the reciprocating movement. The degree of twisting movement is not changed, only its relation to the reciprocating movement is changed; hence the time or place in the stroke or traverse of the valve when it rocks or twists is changed; but the degree to which it rocks is unchanged. I am aware thata Wabble-gear has been used in a valve-gear for thepurpose of rocking the valve-for example, seePatents NoslSG,185,264,301,79,341,86,070, and 331,436; but in every instance, so far as I am aware, the wabbles are concentric with the shaft, and the angle of the wabble-gcar to the shaft is made variable, and so the degree of rocking movement ofthe valve is changed, and the steam-supply is regulated by the dcgree to which the valve is rocked. In an English patent, No. 4,859 of 1886, there is shown a Wabble which is eccentric to the shaft; but it is not invariably supported at an angle to the shaft. The regulation in that device is effected by varying the angle of the Wabble to the shaft, so as to produce a varying degree of rocking movement in the valve. All this is very different from my device.

The ofiiee of the eccentric F and the sleeve F is to support the eccentric-strap holder or path F2 in eccentrieity to the shaft, and any other means which will so support said part F2 and permit it to be shifted by the governor will of course serve the same o'iice or purpose and be the equivalent of the eccentric and sleeve.

What I claim as new is- 1. In a Steam-engine, the combination, suhstantially as set forth, of a valve having transverse and longitudinal ports c and o2, and a valve-gear Which reciprocates and at the same time rocks the said valve.

2. In a steam-engine, the combination, substantially as set forth, of a piston-valve having longitudinal ports c and transverse ports ci, a valve seat or chamber having longitudinal ports e and transverse ports I), and a valvegear whiehreciprocates and at the same time rocks said valve.

3. In a steam-engine, the combination, substantially as set forth, of a valve having at each end a chamber with longitudinal ports c leading into it and transverse ports cl leading from it, a cylinder having thereon a valve seat or chamber at each end7 having longitudinal ports c' leading from the steam-chest in to said chamber, and transverse ports b leading from said chamber to the cylinder, said ports coinciding in form and position, respectively, with the ports c and cl in the valve, and a valve-gear for moving said valve which iniparts to it both a reciprocating` and a rocking movement.

4. In a steam-engine, the combination, with a reciprocating valve which turns upon its seat to effect a cut-ofi", of a valve-gear for imparting an invariable reciprocating movement to said valve, and also a rolling movement which is invariable in degree, but variable as to the point in the longitudinal traverse of the valve at which said rolling movement begins and ends, which gear consists of an invariable eccentric on the engine-shaft, a sleeve upon said eccentric which can be rolled thereon, an eccentric strap holder or path which is invariably iixed upon said sleeve at an angle to the shaft, an eccentric-strap loose within said path, and an eccentric-rod connected at one end with said strap by trunnions and at the other end with the valverod or stem by a properjoint.

5. In a steam-enginc-valve-gcar, the combination, substantially as set fort-h, of aninvariable eccentric, a sleeve variable by rolling on said eccentric, a diagonal eccentric-strap path invariable upon said sleeve, an eccentric-strap g;

loose within said path, and an eccentric-rod connected with said strap by trunnions in the manner shown, whereby the said eccentricrod Will have imparted to it an invariable reciprocating movement and a rocking movement which is invariable in degree, but variable as to the point in its longitudinal traverse at which said rocking movement begins and ends.

In testimony whereof I affix my signature in presence of two witnesses.

ELIJAI-I F. SPAULDING.

Witnesses:

EDWIN SQUIRE, l HARLEY W. FIsHER.

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